Is there somewhere a list showing the different cost of different calculations?
For example:

  • Perform transaction: 21'000 gas
  • calculate a hash: 30 gas
  • addition of two numbers: 3 gas
  • cycle in a loop: 1 gas
  • ...

Take a look to http://ethdocs.org/en/latest/contracts-and-transactions/account-types-gas-and-transactions.html.

Also, check the following spreadsheet: https://docs.google.com/spreadsheets/d/1m89CVujrQe5LAFJ8-YAUCcNK950dUzMQPMJBxRtGCqs/edit

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